.pragma library

var densidade = 4;

function mm2px(mm) {
    return mm * densidade;
}

function dp2px(dp) {
    return mm2px(dp  * 0.15875); // 1dp = 0.15875mm
}

function setDensidade(density) {
    densidade = density
}

function deg2rad(deg) {
  return deg * (Math.PI/180)
}

function calcDistance(lat1,lon1,lat2,lon2) {
  var R = 6371; // Radius of the earth in km

  var dLat = deg2rad(lat2-lat1);  // deg2rad below
  var dLon = deg2rad(lon2-lon1);
  var a =
    Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
    Math.sin(dLon/2) * Math.sin(dLon/2)
    ;
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  var d = R * c; // Distance in km

  d = parseFloat(Math.round(d * 100) / 100).toFixed(2);

  return d + " Km";
}
